Rotation mechanism for rock drills



" 31%, mm E. B. LEAR RCTATION MECHANISM FOR ROCK DRILLS Filed June 1929 IN VEN TOR. v flea? M; M Hi5 ATTORNEY I JIM! Patented Aug. 19, 1930 UNEZEZED stares rAr;ENroE 1.c

EAEEELEAE, PHILYLIZPSBU'RG, NEW JERSEY, AsSreNoE T0 INGEESQLEEAND coivr- PANY, 0F JERSEY CITY, NEW JERSEY, A CORPORATION, OF NEW JERSEY ROTATION MECHANISM FOR Rock DEILL'S tion of a rock drill equipped with rotation flmechanismconstructed in accordance with the practice of' the lnventlon,

"Fi ure 2 is a transverse view taken throu h figure 1 on the line 2 2 looking in the. di

rection indicated by the arrows,

Figure 3 is a plan view of a detail taken I through Figure 1 on the line 33 looking inthe direction indicated by the arrows, and Figure 4 is a longitudinal view partly in "i section showing amodified'form' of a detail of the invention.

*Referring to the drawings the'invention fis shown applied to a rock drill'designated jgenerallyby A and comprising a cylinder '13 i and front and backheadsfC and Drespec tively. The cylinder B is boredto 'form a piston chamber E t for the accommodation of a reciprocatory hammer piston, F adapted "to actuate a working element G which extends :i into a chuckH disposedr'otatably within'the "front headC. y I V A closure is provided for the front end of the piston chamber'E by a front cylinder washer J which also serves to centralize the v 40' cylinder and the front head with respect to each other. In the construction shown the I back head D is seated directly on the'rearward end of the cylinder and forms a closure for the same end ofthe piston chamber E.

The distribution ofpressure fluid to the ends of the'piston chamber for actuating the pi'stonF may be eifectedby any suitable and 5 'iconvenient manner. The means illustrated for this purpose comprises a' valve chest K- Application filed June 8,

1929. Serial No. seamed posed an oscillatory plate valve adapted to control inlet passages P and Q, leading from the front and rearward ends respec tively of the valve chamber L to the corresponding ends of the piston chamber.

- Pressure'fluid for operating the drill may be conveyed from a suitable's'ource of sup ply (not shown) throughaconnection R and the flow of pressure fluid from the connectionR to the valve chamber-L may be con trolled bya suitable throttle'valve' S. The exhaust offluid from the piston chamber E is effected through exhaust ports T in the cylinder and said exhaust portsare controlled bythepistonF. 1

In accordance with thepr'actice; of the inventionmeans are provided for eifectin'g a step by step rotary movement of the Working implement G' in order to changeits position with respect to the work for each blow of the hammer piston F. 'Theme'ans'pro- 'vided forfthis purpose comprises an anvil block U which is slidably guided'by a bore ,V in'the front cylinder washer 'J'and carries afbar W which extends entirely through the piston chamber E and therefore also through the hammer piston F. The rearward end of the bar lV may have ajreduced portion Xto extend 'slidably into the back head'D, or, as illustratechinto a bushing Y seated in the back headto form bearing for the portion X Y,

'The ,bar W may,if desircdfforman integral part of the anvilblock U as indicated in Figure 1 'or may be formed separately as illustrated'inFigured and be suitably interlocked with the anvil block U. In the lat ter casethe barW maybe provided with a polygonal end Z toextend into a correspondingly shaped bore b 'in theanvilblock U.

In order to translate the 're'ciprocatory movement of the hammer piston Fjinto a rotary movement of the anvil block U the bar W is provided- 1 with spiralled ribs 0 which engage similar ribs'd of a spirally fluted nut e th'readed'intothe' rearward end of-the piston- The portion of the hammer piston *F forwardly ofthe nut e is preferably in slidtable -'engagement with the bar W to prevent i having a" valve chamber L inwhichisdis 'the'passagebf pressure" fluid from one end of the piston chamber E to the other through the piston.

Means are provided for transmitting the rotary movement of the anvil block U to the chuck H. The anvil block U is accordingly provided with a series of longitudinal flutes f to accommodate introverted ribs 9 of a head it which encircles the anvil block U. The ribs 9 may be of such proportions that the anvil block U may reciprocate freely relatively tothe head h. r I r r The head h lies in a cavity j in the rearward end of the chuck H and bears with one end against the chuck and with its other end against the surface of the front cylinder washer J. Spring pressed pawls 7c are carried by the head it to engage ratchet teeth 0 in the chuck H for holding the head against rotary movement during the rearward stroke 01 the hammer piston F. i

In order to prevent rotary movement of the hammer piston F relatively to the cylinder '13 said cylinder is provided with a key or keys p which engage key-ways g in the hammer piston F. The keys p and the key-ways g are of such lengths that the piston will remain in engagementwith the keys throughout the'entire stroke of the piston.

The operation of the-device is as follows: With the parts in the positions illustrated in Figure 1 and upon the admission of pressure fluid into the rearward end of the piston chamber E the piston F will be driven forwardly to deliverits blow against the anvil block U. The-blow of the piston will thus'be transmitted by the anvil block to theworking implement G. During this movement of the piston F the anvil block U will of course be rotated a partial revolution due to its spiral engagement with the piston and to the fact that the piston is incapable of rotary movement. of theanvil block U will not be then transmitted to the chuck I-I' since the movement of the head 72, will be in a direction in which the pawls will merely pass over the ends of the ratchet teeth 0.

After the piston has delivered its blow against the anvil block and moves in a rearwardly direction it will again rotate the anvil block and during this movement of the anvil block the pawls is will engage the ratchet teeth 0 and thus transmit the rotary movement of the anvil block U to the chuck H and consequently also to the working implement G. From this point the cycle of operations may be repeated.

I'claim: I y

1. In rotation mechanism forrock'dri'lls, the combination of a cylinder and a rotatable chuck, a working implement in the chuck, a

hammer piston in the cylinder to actuate the work ng implement, means for preventing rotation of the piston in the cylinder, means a for transmitting the blows of the hammer pis- However, the rotary movement ton to the working implement, a bar asso ciated with said means and having spiral ribs interlockingly engaging the hammer piston to effect rotation of said means during the reciprocations of the hammer piston, and means for transmitting the. rotary movement of the first said means to the chuck.

2. In rotation mechanism for rock drills, the combination of a cylinder and a rotatable chuck, a working implement in the chuck, a hammer piston in the cylinder to actuate the working implement, means for preventing rotation of the piston in the cylinder, means for transmitting the blows of the hammer piston to the working implement, a bar associated with said means and having spiral ribs interlockingly engaging the hammer piston to efiect rotation of said means during the reciprocations of the hammer piston, and

-means associated with the said means for transmitting the rotary movement of the first said means to the chuck during the stroke of the piston in one direction.

3. In rotation mechanism for rock drills, the combination of a cylinder and a rotatable chuck, a working implement in the chuck, a hammer piston in the cylinder to actuate the working implement, means for preventing rotation of the piston in the cylinder, means for transmitting the blows of the hammer piston to the working implement, a bar associated with said means and having spiral ribs interlockingly engaging the hammer piston to effect rotation of said means during the reciprocation of the hammer piston, and means associated with the said means for transmitting the rotary movement of the first said means during the rearward stroke of the piston.

A. In rotation mechanism for rock drills, the combination of a cylinder and a rotatable chuck,'a working implement in the chuck, a

reciprocatory hammer piston in the cylinder to actuate the working implement, means for preventing rotation of the piston in the cylinder, an anvil block for transmitting the blows of the hammer piston to the working I implement, a bar carried by the anvil block and having spiral ribs to interlockingly engage the piston for eflecting'rotation of the anvil block, a head in fluted engagement with the anvil block, ratchet teeth carried by the chuck, and spring-pressed pawls in the head adapted to cooperate with the ratchet teeth to effect a step by step rotary movement of the chuck during the reciprocation of the piston.

5. In rotation mechani sm for rock drills, the combination of a cylinder and a rotatable chuck, a working implement in the chuck, a

reciprocatory hammer piston in the cylinder.

to actuate the'working implement, means for preventing rotation of the piston in the cylinder, 'an anvil block to transmit the blows of the hammer piston to the working implement, a bar carried by the anvil block, a

- closure for the cylinder acting as a bearing for the free end of the bar, spiralled ribs on the bar interlockingly engagin the piston to effect rotation of the anvil bloc during the stroke of the piston in one direction, a head encircling the anvilblock and in fluted engagement therewith, ratchet teeth carried by the chuck, and spring-pressed pawls in the head engaging the ratchet teeth to transmit the rotary movement of the anvil block to the chuck.

6. In rotation mechanism for rock drills,

the combination of a cylinder and a rotatable chuck, closures for the ends of the cylinder,

an anvil block slidably guided by one closure and having a bar extending slidably into another closure, a hammer piston'in the cylinder for delivering blows of impact against the anvil block, spiralled ribs on the bar interlockingly engaging the piston to effect a rotary movement of the anvil block during the stroke of the piston in one direction, means for holding the piston against rotation in the cylinder, a head encircling the anvil block and in fluted engagement therewith, ratchet teeth carried by the chuck, and

spring-pressed pawls in the head engaging the ratchet teeth to transmit the rotary movement of the anvil block to the chuck.

specification.

In testimony whereof I have signed this EARL B. LEAR. 

